Internal duct crimper

ABSTRACT

A CRIMPING DEVICE FOR BENDING AND CLENCHING EDGES OF LATERALLY EXTENDING DUCTS TO MAIN DUCTS INCLUDING A BIFRUCATED ARM STRUCTURE WITH A CLENCHING DEVICE AND ANVIL PROVIDED ON THE END OF ONE OF THE ARMS WITH MEANS FOR SHIFTING THE CLENCHING MEMBER INTO CLENCHING POSITION AGAINST THE ANVIL THROUGH THE UTILIZATION OF A CONNECTED ARM AND LEVER DEVICE. THE CLENCHING MEMBER INCLUDES A   ROTATABLY MOUNTED SHOE WITH AN ACTUATING ARM CONNECTED THERETO WHICH ACTUATING ARM EXTENDING UPWARDLY ALONG THE BIFURCATED ARM TO AN OPERATIVE POSITION.

March 16, 1971 A, ww|ETER5 INTERNAL DUCT CRIMPER Filed Jan. 2l, 1969 Sheets-Sheet Il.

m n W w v E 8 A 1 1 I l A I FJ'EIE March 16, 1971 A. w. wlETERs INTERNAL DUCT CRMPER 2 Sheets-Shoet il Filed Jan. 2l, 1969 Ima/2W #from/sy United States Patent O 3,570,299 INTERNAL DUCT CRIMPER Albert W. Wieters, 7438 Baker Ave. NE., Minneapolis, Minn. 55432 Filed Jan. 21, 1969, Ser. No. 792,310 Int. Cl. B21d 5 01 U.S. Cl. 72--409 6 Claims ABSTRACT F THE DISCLOSURE A crimping device for bending and clenching edges of laterally extending ducts to main ducts Iincluding a bifurcated arm structure with a clenching device and anvil provided on the end of one of the arms with means for shifting the clenching member into clenching position against the anvil through the utilization of a connected arm and lever device. The clenching mem-ber includes a rotatably mounted shoe with an actuating arm connected thereto which actuating arm extends upwardly along the bifurcated arm to an operative position.

In the past various duct clenching devices and tools have lbeen provided and in particular a device is disclosed and claimed in a patent issued to me July l1, 1967, Pat. No. 3,330,147, for a Center Tap Duct Crimper. This particular patented device properly performs the duct crimping operation but is specifically designed for use with what are commonly known as center tap duct units which will form a connective leg for the attachment to the additional duct lengths thereto. The duct crimper which forms the subject matter of this particular invention relates to the attachment of laterally extending duct sections which may be the termination of the laterally extending duct and to which registers or other such nishing devices may be attached. These particular ducts have an internal crimp section such that all of the connective portions of the duct are normally hidden from view upon completion of installation.

To properly operate, this particular unit then must provide an internally working clamping unit for the proper bending and crimping of the internally arranged duct elements.

It is therefore an object of applicants invention to provide a duct crimper wherein the crimping mechanism including a shoe and anvil device is `carried completely on one leg of the unit.

It is a further object of applicants invention to provide an internal duct crimper which includes a bifurcated leg section wherein one of the leg members is utilized as a holding device with the other leg member providing the entire bending mechanism for properly bending the duct sections for joining thereof.

It is a further object of applicants invention to provide an internal duct crimper which includes a bifurcated leg structure having a pair of upstanding handles, one of which handles is shiftable and moveable to provide and transmit proper bending power to a bending mechanism located adjacent the lower end of the leg.

It is still a further object of the applicants invention to provide an internal duct crimper which includes a bifurcated leg structure wherein the leg members cooperate for holding the duct in proper position while properly bending a portion of the duct to provide attachment to the main duct line.

These and other objects and advantages of my invention will more fully appear in connection with the accompanying description and drawings, wherein like reference characters refer to the same or similar parts throughout the several views, and in which:

FIG. 1 is a side elevation of the main operative portions of a duct crimper embodying the concepts of ap- Fice plicants invention in position to crimp or ybend a duct section into connected position;

FIG. 2 is a vertical section taken substantially along line 2 2 of FIG. 1 and FIG. 3 is a View similar to FIG. l illustrating the shifting of the crimping portions of applicants device to properly crimp the duct section into proper connected position.

In accordance with the accompanying drawings the duct crimper provided by applicant is generally designated i1() and is illustrated in position for crimping an internal duct section 11 into a main duct 12. A duct 11 of this internal type is provided with the normal longitudinally extending sides '13 wherein the extending end 14 thereof is provided to extend inwardly into the duct area with the crimping end 15 extending inwardly with a longitudinally extending flange i16 thereon which liange 16 is received into a duct receiving passage -17 cut into the main duct 12 and is subsequently bent to clench the main duct portion between the extending flange 16 and the end portion 15.

As illustrated in the drawings the tool '10y provided by applicant includes a rst upstanding stationary handle member 20 terminating in a bifurcated arm structure having and providing a pair of arms designated respectively 21 and -22 which arms are of a predetermined length and are spaced apart a predetermined dimension to provide a duct receiving longitudinal passage 23 therebetween.

The lirst such arm 22 is in the form shown normally spaced parallel to and outward from the first arm 21 and this arm 22 includes in the form shown a bracing member 24 at the lower end thereof which member 24 is of a predetermined width to provide a predetermined bearing area against the outside of the duct side 11. In the form shown this arm 22 has at its upper end a pair of spaced lever holding elements 25-26 to which the upper end 22a of the arm is attached such that a rotatable lever mounting area 27 is provided between the upper ends 25-26 of the arm 22. A moveable lever arm 28 is mounted between these aforementioned plates 25-26 through the utilization of a mounting pin 29 or the like. The idea of this mounting is of course to provide proper bearing sides for the actuating lever 28 to achieve the proper movement of the duct clenching apparatus. It should be noted that the member 24 on this particular arm 22 is raised slightly with respect to the lower clamping section 30 arranged on the lower end of the other existing arm 21. This particular spacing of the arm lengths will be obvious as this description continues.

The clamping and crimping section 30 arranged on the lowermost portion of the other bifurcated leg 21 includes a first anvil device 31 of a predetermined Width extending from the leg 21 towards the first bracing member 24 and as illustrated the topmost surface of this anvil is slightly below the bottom most surface 24a of the member 24. This particular arrangement is provided such that the upper end 14 of the duct 11 may bereceived between the bifurcated legs for receiving the tool on the duct. Obviously if the legs 21-22 were of the same length it would be difficult to mount this device 10 about the duct.

In normal extending relation to the leg 21 is a crimping shoe mounting device 32 which mounting device includes a pair of 'bifurcated arms 32a-32b spaced to permit the shoe member 33 to be mounted with a single connective section 34 therebetween and a pin member 35 is provided to permit rotation of the shoe 33- therearound between the arms 32a-32b such that the shoe may be brought into crimping registration with the anvil 31 as illustrated in FIG. 33. The upstanding single connective section 34 of the shoe 33 is connected to the moveable lever arm 28 through an operating rod 36 and in order to obtain the greatest possible leverage arrangement the operative lever arm 28 is provided with an offset operating lever connecting portion 28a. Naturally the operating rod 36 is rotatablymounted in passages 28h, 34a in the respective operating lever arm 28 and the shoe lever member 34.

In order to obtain the proper clenching or crimping of the downwardly depending portion 16 of the duct particular attention must be paid to the positioning of the rotative pin connector 35 of the shoe 33 such that in closed position as illustrated in FIG. 3 a proper crimp or bend over of the duct 16 may be provided and obtained.

As illustrated the anvil portion 31, the shoe portion 33 meeting with the anvil 31 and the backing plate 34 of the arm 22 are of a predetermined width to engage a substantial length of material therebetween. By providing these members of substantial length it will of course be possible to obtain a smooth bend of the duct portion 16 rather than a series of small incremental bends.

As illustrated the handle members 20-28 are not shown at full length and obviously depending upon the particular material with which this tool may be utilized a relatively long or short handle section may be provided. In order to permit proper actuation of the lever 28 and connector rod 36 it should be obvious that the entire arm 21 may be formed of two spaced apart plate members which extend the entire length of the device to form a channel therebetween Within which the connector rod 36 may operate.

The use of the particular tool 10 should be obvious to those skilled in any type of duct work installation and it should be noted that this particular tool is designed for what may be called an internal duct system in which the duct joinder elements are hidden. The use of the tool naturally includes proper placement of the tool 10` into the duct arrangement such that the anvil 31 is adjacent the passage 17 in the main duct 12 and such that the shoe 33 is in proper position to bend the downwardly extending duct element 1'6. Upon such proper location it is only necessary to shift the handle 28 from the position illustrated in FIG. 1 to the position illustrated in FIG. 3 where the handle members are in substantially parallel adjacent relationship. This shifting will push the rod member 36 downwardly thus forcing the shoe 33 through the connective linkage 34 about the pivot point 35 to urge the same upwardly into substantially parallel spaced apart relationship with the anvil 33 whereby the duct element 1'6 is clenched about the main duct system 12. It is now a simple method to spread the handles and shift the crimping tool longitudinally along the duct section to the next adjacent position where crimping is necessary and in this manner it should be obvious that a crimp may be formed entirely along the duct structure thus positively joining the two ducts along all available points.

It should be obvious that applicant has provided a unique crimping tool which permits the installation of internal duct members at a rapid rate.

What is claimed is:

1. A bending tool for making internal type ilange crimps in ducts including:

(a) an elongated bifurcated member having a pair of leg members spaced apart a predetermined distance one of said leg members engaging the exterior pif tie duct and the other extending inwardly of the (b) a stationary forming member secured to the interiorally extending leg adjacent the end thereof;

(c) a rotatable forming member mounted adjacent the end of the interiorally extending leg shiftable into forming position with said stationary member;

(d) a pair of handle members extending from said bifurcated member, one of said handle members being shiftably mounted; and

(e) an actuating arm member between said shiftable handle and said rotatable forming member for shifting the same into bending registration with said stationary forming member the spacing between said legs and engagement with the duct exterior holding said forming members in proper flange bending position.

2. The structure set forth in claim 1 and said stationary forming member arranged to extend from said interiorally extending leg generally toward said other leg.

3. The structure set forth in claim 1 wherein said duct engaging leg terminates in spaced vertically adjacent relation to the end of said interiorally extending leg.

4. The structure set forth in claim 1 and a stop member on the end of said duct engaging leg.

5. The structure set forth in claim 4 and said stop member arranged in spaced vertically adjacent relation to said stationary forming member.

6. The structure set forth in claim 1 and said rotatable forming member being arranged and positioned with respect to said stationary member to be in spaced parallel position with respect thereto when in closed position.

References Cited UNITED STATES PATENTS 2,229,571 1/1941 Johnson 72-458 2,572,738 10/1951 Lovinggood 72-409 2,944,503 7/-1960 Wilson 113-54 3,270,782 9/ 1966 Klang 72-409 3,330,147 7/1967 Wieters 113--54 3,477,272 11/ 1969 Hunter 113-54 'CHARLES W. LANHAM, Primary Examiner G. P. CROSBY, Assistant Examiner U.S. C1. X.R. 72-450; 113-54 

